20111312042 has 4 divisors (see below), whose sum is σ = 30166968066. Its totient is φ = 10055656020.

The previous prime is 20111312041. The next prime is 20111312077. The reversal of 20111312042 is 24021311102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11234092081 + 8877219961 = 105991^2 + 94219^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20111312042.

It is not an unprimeable number, because it can be changed into a prime (20111312041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5027828009 + ... + 5027828012.

Almost surely, 2^20111312042 is an apocalyptic number.

20111312042 is a deficient number, since it is larger than the sum of its proper divisors (10055656024).

20111312042 is a wasteful number, since it uses less digits than its factorization.

20111312042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10055656023.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20111312042 its reverse (24021311102), we get a palindrome (44132623144).

The spelling of 20111312042 in words is "twenty billion, one hundred eleven million, three hundred twelve thousand, forty-two".